A Practice Note addressing patent specification requirements in China (PRC), including sufficiency, best mode or method, and claim definiteness and clarity.

This Note provides useful information for patent counsel with responsibility for a global patent portfolio to understand the legal framework for determining if a patent application filed at the China National Intellectual Property Administration (CNIPA) meets patent specification requirements, the potential scope of protection of the patent, and the invalidity risk to their client's patent or third-party patents in China.